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内容説明 The most non-trivial of the established microscopic theories of physics is QCD: the theory of the strong interaction. A critical link between theory and experiment is provided by the methods of perturbative QCD， notably the well-known factorization theorems. Giving an accurate account of the concepts， theorems and their justification， this book is a systematic treatment of perturbative QCD. As well as giving a mathematical treatment， the book relates the concepts to experimental data， giving strong motivations for the methods. It also examines in detail transverse-momentum-dependent parton densities， an increasingly important subject not normally treated in other books. Ideal for graduate students starting their work in high-energy physics， it will also interest experienced researchers wanting a clear account of the subject.